Finding the Fourth Proportional to 1,408.59, 1,940.72 and 1,277.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.59 : 1,940.72 = 1,277.55 : x
2. Step 2: Convert to fraction form
   1,408.59/1,940.72 = 1,277.55/x
3. Step 3: Cross multiply
   1,408.59x = 1,940.72 × 1,277.55
4. Step 4: Simplify right side
   1,408.59x = 2,479,360.45
5. Step 5: Solve for x
   x = 2,479,360.45/1,408.59
6. Step 6: Final answer
   x = 1,760.17